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Old 10-23-2000, 08:48 AM   #1
Scooby Specialist
Member#: 1737
Join Date: Jun 2000
Chapter/Region: NWIC
Location: 3rd Generation Seattle Local
2005 BMW zhp

Arrow Aftermarket catback install question..nuts/bolts rattling off

Hey all..

I just put my 5zigen cat back system on and a week later after it got progressively louder, I put it on the ramps again and one of the bolts between the 5zigen center pipe and the zigen exhaust had disappeared. Thus the noise.

I was unhappy with the fit between the 5zigen center pipe and the stock cat pipe so i put the stock center pipe back in and connected it to the zigen exhaust with the gasket inbetween.

My question is how does leaving out the washers influence the nuts/bolts rattling off eventually? What are the best washers to use here and where should i use them to hold this thing together better?


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Old 10-23-2000, 08:55 AM   #2
Scooby Newbie
Member#: 2253
Join Date: Sep 2000
Location: Mentor, Ohio, USA
2000 2.5 RS


Torquing down the fastner the proper amount will keep the fastener from rattling apart. Use a split washer to help keep tension on the fastners. You might want to use a mild Lock Tight, not the heavy duty stuff.
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Old 10-23-2000, 10:24 PM   #3
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Member#: 1426
Join Date: May 2000
Chapter/Region: NESIC
Location: New Boston, NH
'07 335xi, '07 ZX6R
SV650 Race Bike


To echo what Storer said, you can either use a lockwasher which looks like a washer with a slit halfway through it....or use a Nyloc, which is a steel nut with a nylon insert which greatly improves retention forces. The fit is kinda crappy from the cat to my mid pipe (2.25" apexi) but so far no leaks. I went the Nyloc route..just FYI.

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